Here is the link to the documentation that helped me a lot, and thanks to it TA-Lib was installed in less than 5 minutes (I was installing FreqTrade and an error about the ta-lib installation were shown) :
https://blog.quantinsti.com/install-ta-lib-python/
Here I write the lines that helped me (in case the link above were suppressed) :
sudo apt-get -y install gcc build-essential
wget -O inst_conda.sh "https://repo.anaconda.com/archive/Anaconda3-2020.11-Linux-x86_64.sh" \
&& /bin/bash inst_conda.sh -b \
&& rm inst_conda.sh \
&& ./anaconda3/bin/conda init \
&& source ~/.bashrc \
&& conda create -n quantra python=3.6.8 -y \
&& conda activate quantra
wget http://prdownloads.sourceforge.net/ta-lib/ta-lib-0.4.0-src.tar.gz \
&& sudo tar -xzf ta-lib-0.4.0-src.tar.gz \
&& sudo rm ta-lib-0.4.0-src.tar.gz \
&& cd ta-lib/ \
&& sudo ./configure --prefix=/usr \
&& sudo make \
&& sudo make install \
&& cd ~ \
&& sudo rm -rf ta-lib/ \
&& pip install ta-lib